<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org"
      xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
   <head>
           <title>Spring Security Example </title>
       </head>
   <body>
       <form th:action="@{/doLogin}" method="post">
               <div><input type="submit" value="Sign out"/></div>
           </form>

   </body>
</html>